DE102018207765B4 - ELECTRIC BRAKING SYSTEM - Google Patents

Abstract

An electric braking system comprising: a pedal operator (100) connected to a brake pedal (10) and configured to send an intention to brake to an electronic control unit; a reservoir (30) configured to store a working fluid; a pressure delivery device ( 200) provided with an energizing driver (201) and configured to generate hydraulic pressure for a plurality of wheel brakes (21, 22, 23, 24); and a brake pressure regulator (300) configured to regulate a hydraulic pressure generated by the pressure supply device (200) and transmitted to the wheel brake (21, 22, 23, 24), the brake pressure regulator (300) having a first hydraulic circuit ( S1) hydraulically connected to two wheel brakes (21, 22) and a second hydraulic circuit (S2) hydraulically connected to the other two wheel brakes (23, 24), the first hydraulic circuit (S1) and the second hydraulic circuit (S2) with a plurality of inlet lines (311, 312, 313, 314) connecting the pressure supply device (200) to each of the wheel brakes (21, 22, 23, 24), and a plurality of outlet lines (321, 322, 323, 324 ) connecting each of the wheel brakes (21, 22, 23, 24) to the reservoir (30) or connecting each of the wheel brakes (21, 22, 23, 24) to the pedal operator (100), the first hydraulic circuit (S1) and the second hydraulic circuit (S2) are hydraulically separated from each other to form a hyd hydraulic pressure transmitted from the other hydraulic circuit to the wheel brake (21, 22, 23, 24) when one of the hydraulic circuits (S1, S2) is abnormal is to be regulated;wherein the plurality of intake pipes (311, 312, 313, 314) a first inlet line arranged in the first hydraulic circuit (S1) and provided with a first inlet valve (V11), a second inlet line arranged in the first hydraulic circuit (S1) and provided with a second inlet valve (V12), a third inlet pipe arranged in the second hydraulic circuit (S2) and provided with a third inlet valve (V13) and a fourth inlet pipe arranged in the second hydraulic circuit (S2) and provided with a fourth inlet valve (V14); andthe plurality of outlet lines (321, 322, 323, 324) a first outlet line arranged in the first hydraulic circuit (S1) and provided with a first outlet valve (V21), a second outlet line arranged in the first hydraulic circuit (S1) and is provided with a second outlet valve (V22), a third outlet line arranged in the second hydraulic circuit (S2) and provided with a third outlet valve (V23), and a fourth outlet line arranged in the second hydraulic circuit (S2) and having is provided with a fourth exhaust valve (V24), characterized in thatelectrical actuation of the first to fourth intake valves (V11, V12, V13, V14) independently of electrical actuation of the first to fourth exhaust valves (V21, V22, V23, V24 ) is controlled in such a way that simultaneous closing caused by malfunctions is prevented.

Description

BACKGROUND

1st area

The disclosure relates to an electric braking system, and more particularly to an electric braking system configured to generate braking force using an electrical signal corresponding to pedal displacement.

2. Description of the Prior Art

A vehicle is essentially equipped with a braking system for braking. Recently, various types of systems for obtaining stronger and more stable braking force have been proposed.

Examples of the braking system include an anti-lock braking system (ABS) that prevents wheel slippage during braking, a brake slip control system (BTCS) that prevents drive wheel slippage during sudden unintended acceleration or sudden acceleration, and an electronic Stability Control System (ESC) that stably maintains the vehicle's driving state by controlling hydraulic braking pressure by combining an anti-lock braking system with slip control.

In general, an electric braking system includes an actuator that receives an electric signal corresponding to a driver's braking intention from a pedal displacement sensor configured to detect a displacement of the pedal and provides pressure to a wheel cylinder when the driver presses the pedal.

The electric braking system equipped with such an actuator is in the European patent EP 2 520 473 disclosed. According to the disclosed document, the actuator is configured to generate braking pressure by operating a motor according to a pedaling force of a pedal, the braking pressure being generated by pressurizing a piston by converting torque of the motor into linear motion. DE 10 2017 214 187 A1 describes a braking system with features of the preamble. Other braking systems are off DE 10 2013 224 870 A1 and DE 10 2012 204 263 A1 known.

Related Prior Art Documents

patent documents

• EP 2 520 473 A1 (Honda Motor Co., Ltd.) 2012, 11.7;
• DE 10 2017 214 187 A1 ;
• DE 10 2013 224 870 A1 ; and
• DE 10 2012 204 263 A1

SHORT VERSION

It is therefore an aspect of the present disclosure to provide an electric braking system according to the preamble capable of generating braking pressure using an actuator operated in a double action manner.

It is another aspect of the present disclosure to provide an electric brake system capable of responding to an abnormal operation situation of an actuator. In particular, the present invention proposes an electric braking system according to claim 1. Individual embodiments are specified in the dependent claims.

Additional aspects of the present disclosure are set forth in part in the following description, and in part are obvious from the description, or may be learned by applying the present disclosure.

According to one aspect of the disclosure, an electric braking system includes: a pedal operator connected to a brake pedal and configured to send an intention to brake to an electronic control unit; a reservoir configured to store a working fluid; a pressure supply device provided with a driver that supplies power and configured to generate hydraulic pressure for a plurality of wheel brakes; and a brake pressure regulator configured to regulate a hydraulic pressure generated by the pressure supply device and transmitted to the wheel brake, the brake pressure regulator having a first hydraulic circuit hydraulically connected to two wheel brakes and a second hydraulic circuit hydraulically connected to the other two wheel brakes, wherein the first hydraulic circuit and the second hydraulic circuit are provided with a plurality of inlet lines connecting the pressure supply device to each wheel brake and a plurality of outlet lines connecting each of the wheel brakes to the reservoir or connecting each of the wheel brakes to the pedal operator, ver are seen, wherein the first hydraulic circuit and the second hydraulic circuit are hydraulically separated from each other to regulate a hydraulic pressure that is transmitted through the other hydraulic circuit to the wheel brake when one of the hydraulic circuits operates abnormally.

The plurality of inlet lines may include: a first inlet line arranged in the first hydraulic circuit and provided with a first inlet valve, a second inlet line arranged in the first hydraulic circuit and provided with a second inlet valve, a third inlet line arranged in the second hydraulic circuit and provided with a third inlet valve, and a fourth inlet line arranged in the second hydraulic circuit and provided with a fourth inlet valve; and the plurality of outlet lines may include: a first outlet line arranged in the first hydraulic circuit and provided with a first outlet valve, a second outlet line arranged in the first hydraulic circuit and provided with a second outlet valve, a third outlet line arranged in the second hydraulic circuit and provided with a third outlet valve, and a fourth outlet line arranged in the second hydraulic circuit and provided with a fourth outlet valve, wherein the first to fourth inlet valves and the first to fourth outlet valves can be an analog normally open valve .

The pressure delivery device may include: a first piston actuated by receiving energy, and a pump chamber having a volume variable according to a displacement of the first piston, each of the first through fourth inlet passages further including a corresponding first through fourth check valve disposed between the pump chamber and a corresponding one of the inlet valves and configured to permit only one-way flow from the pump chamber to the inlet valve.

The first to fourth intake valves may be connected to two different power grids such that if one of the power grids fails, the first to fourth intake valves are operated by the other power grid.

The first through fourth exhaust valves may be connected to two different power systems such that if one of the power systems fails, the first through fourth exhaust valves are operated by the other power system.

Electrical actuation of the first through fourth intake valves may be independent of electrical actuation of the first through fourth exhaust valves to prevent simultaneous closing caused by malfunctions.

The pump chamber may include: a first pump chamber located in front of the first piston and a second pump chamber located behind the first piston, the pump chamber further including a first pump reservoir line configured to connect the first pump chamber to the reservoir , and is provided with a check valve that allows only one-way flow from the reservoir to the first pump chamber, and a second pump-reservoir line that is configured to connect the second pump chamber to the reservoir and is provided with a check valve that only allows one-way flow from the reservoir to the second pump chamber.

The electronic control unit may include a first electronic control unit connected to the first power grid and a second electronic control unit connected to the second power grid configured to operate selectively or in concert with the first power grid.

The pressure-feeding device may be operated by the second electronic control unit when the first electronic control unit is abnormal, or by the first electronic control unit when the second electronic control unit is abnormal.

The electric brake system may further include: a pedal displacement sensor configured to detect a displacement of the brake pedal, a circuit hydraulic pressure sensor configured to detect a hydraulic pressure of the first hydraulic circuit or the second hydraulic circuit; and a driver displacement sensor configured to detect an amount of rotation of the driver, wherein the pedal displacement sensor, the hydraulic pressure sensor, and the driver displacement sensor may include a main sensor and an auxiliary sensor, respectively, wherein the auxiliary sensor may be a redundant sensor configured to operate when the Main sensor is working abnormally.

The pedal operator may include a second piston connected to the brake pedal, an elastic member configured to provide a reaction force corresponding to a pedaling force of the brake pedal, and a pedal displacement sensor configured to measure a user's braking intention, wherein the Pedal operator can be hydraulically separated from the brake pressure regulator.

The electric brake system may further include: a third pump reservoir line configured to connect the first pump chamber to the reservoir and provided with a check valve allowing only one-way flow from the first pump chamber to the reservoir and a drain valve; and a fourth pump-reservoir line configured to connect the second pump chamber and the reservoir, and provided with a check valve allowing only one-way flow from the second pump chamber to the reservoir and a second drain valve.

The pedal operator may include: a cylinder unit provided with a second piston connected to the brake pedal; and a simulator unit hydraulically connected to the cylinder unit to provide a reaction force corresponding to a pedaling force of the brake pedal, the cylinder unit including a cylinder chamber whose volume is changeable by the second piston and a pressure chamber whose volume is changeable by a pressure member can.

The brake pedal and the second piston can be connected to each other by an input rod, and the pressing member can be moved forward and backward by a locking projection arranged on the input rod.

The electric braking system may further include: a first reservoir line configured to connect the reservoir, the pressure chamber, and the simulator unit, the first reservoir line having a first reservoir valve and a check valve arranged in parallel with the first reservoir valve and configured to have only one-way flow from the reservoir to the pressure chamber or allowing only one-way flow from the reservoir to the simulator unit.

The electric braking system may further include a second reservoir line and a third reservoir line configured to connect the reservoir to the cylinder chamber, wherein the second reservoir line may be provided with a normally closed second reservoir valve and the third reservoir line may be configured with a check valve to allow only one-way flow from the reservoir to the cylinder chamber.

The pressure applying device may include: a first piston actuated by receiving power; and a pump chamber variable in volume by displacement of the first piston, the pump chamber may include a first pump chamber located forward of the first piston and a second pump chamber located behind the first piston, the pump chamber further a first pump-reservoir line configured to connect the first pump chamber to the reservoir and provided with a check valve allowing only one-way flow from the reservoir to the first pump chamber; a second pump-reservoir line configured to connect the second pump chamber to the reservoir and provided with a check valve allowing only one-way flow from the reservoir to the second pump chamber; a third pump-reservoir line configured to connect the first pump chamber to the reservoir and provided with a check valve allowing only one-way flow from the first pump chamber to the reservoir and a first drain valve; and a fourth pump-reservoir line configured to connect the second pumping chamber to the reservoir and may include a check valve allowing only one-way flow from the second pumping chamber to the reservoir and a second purge valve.

The first and second exhaust passages may be connected to the cylinder chamber by merging each of the wheel brakes and provided with a check valve configured to allow only one-way flow from each of the wheel brakes to the cylinder chamber.

The third and fourth exhaust lines may be connected to the cylinder chamber by merging from the wheel brake and provided with a check valve configured to allow only one-way flow from the wheel brake to the cylinder chamber.

The pressure applying device may include: a first piston actuated by receiving power; and a pump chamber variable in volume by displacement of a first piston, wherein a pump chamber may include a first pump chamber located forward of the first piston and a second pump chamber located behind the first piston, the pump chamber further a first pump-reservoir line configured to connect the first pump chamber to the reservoir and provided with a check valve allowing only one-way flow from the reservoir to the first pump chamber; a second pump-reservoir line configured to connect the second pump chamber to the reservoir and provided with a check valve allowing only one-way flow from the reservoir to the second pump chamber; a third pump reservoir line used to connect the first th pump chamber configured with the reservoir and provided with a check valve allowing only one-way flow from the first pump chamber to the reservoir, a fourth pump-reservoir line configured for connecting the second pump chamber to the reservoir and with a check valve allowing only one-way flow from the second pump chamber to the reservoir; and a fifth pump tank line, which may be connected to the tank after the third pump tank line and the fourth pump tank line are combined, and provided with a drain valve configured to regulate two-way flow.

The cylinder unit can further include a third piston configured to divide the cylinder chamber into a first cylinder chamber and a second cylinder chamber, wherein the second reservoir line can connect the reservoir to the first cylinder chamber and the third reservoir line can connect the reservoir to the second cylinder chamber .

The electric braking system may further include: a first cylinder line configured to connect the first cylinder chamber to the first hydraulic circuit; and a second cylinder line configured to connect the second cylinder chamber to the second hydraulic circuit, the first cylinder line being connected to the first and second inlet lines and provided with a check valve allowing only one-way flow from the first cylinder chamber to the first hydraulic circuit and the second cylinder line connected to the third and fourth intake lines and provided with a check valve allowing only one-way flow from the second cylinder chamber to the second hydraulic circuit.

The third and fourth exhaust lines can be connected to the cylinder chamber by combining each of the wheel brakes and provided with a normally open cylinder valve.

The pressure delivery device may include: a first piston actuated by receiving energy; and a pumping chamber whose volume is variable by a displacement of the first piston, wherein the pumping chamber may include a first pumping chamber located forward of the first piston and a second pumping chamber located aft of the first piston, the pumping chamber having a first inlet line connecting the first pump chamber to the first hydraulic circuit, a second inlet line connecting the second pump chamber to the second hydraulic circuit, a third inlet line connecting the second pump chamber to the first hydraulic circuit, and a fourth inlet line connecting the first pump chamber connecting to the second hydraulic circuit, wherein the pump chamber may further include a first connection line configured to connect the first inlet line to the third inlet line and having a check valve allowing only one-way flow from the third inlet line to the first inlet line, and a normal a first control valve that is closed, a second connection line configured to connect the fourth intake line to the first connection line and provided with a check valve that allows only one-way flow from the fourth intake line to the first connection line; and a third connecting line arranged in parallel with the second inlet line and provided with a normally closed second control valve.

character list

• 1 eine Ansicht ist, die ein elektrisches Bremssystem nach einem ersten Ausführungsbeispiel illustriert;
• 2 eine Ansicht ist, die eine Druckzuführungsvorrichtung nach dem ersten Ausführungsbeispiel illustriert;
• 3 eine Ansicht ist, die ein elektrisches Bremssystem nach einem zweiten Ausführungsbeispiel illustriert;
• 4 eine Ansicht ist, die eine Druckzuführungsvorrichtung nach dem zweiten Ausführungsbeispiel illustriert;
• 5 eine Ansicht ist, die ein elektrisches Bremssystem nach einem dritten Ausführungsbeispiel illustriert;
• 6 eine Ansicht ist, die einen Pedaloperator nach dem dritten Ausführungsbeispiel illustriert;
• 7 eine Ansicht ist, die ein elektrisches Bremssystem nach einem vierten Ausführungsbeispiel illustriert;
• 8 eine Ansicht ist, die einen Pedaloperator nach dem vierten Ausführungsbeispiel illustriert;
• 9 eine Ansicht ist, die ein elektrisches Bremssystem nach einem fünften Ausführungsbeispiel illustriert;
• 10 eine Ansicht ist, die ein elektrisches Bremssystem nach einem sechsten Ausführungsbeispiel illustriert;
• 11 eine vergrößerte Ansicht ist, die einen Pedaloperator nach dem sechsten Ausführungsbeispiel illustriert;
• 12 eine vergrößerte Ansicht ist, die eine Druckzuführungsvorrichtung nach dem sechsten Ausführungsbeispiel illustriert;
• 13 eine Ansicht ist, die ein elektrisches Bremssystem nach einem siebenten Ausführungsbeispiel illustriert;
• 14 eine Ansicht ist, die ein elektrisches Bremssystem nach einem achten Ausführungsbeispiel illustriert;
• 15 eine vergrößerte Ansicht ist, die eine Druckzuführungsvorrichtung nach dem achten Ausführungsbeispiel illustriert;
• 16 eine Ansicht ist, die ein elektrisches Bremssystem nach einem neunten Ausführungsbeispiel illustriert;
• 17 eine Ansicht ist, die ein modifiziertes Beispiel des elektrischen Bremssystems nach dem neunten Ausführungsbeispiel illustriert; und
• 18 eine Ansicht ist, die ein elektrisches Bremssystem nach einem zehnten Ausführungsbeispiel illustriert.

These and/or other aspects of the disclosure will become apparent and more readily understood from the following description of exemplary embodiments given in connection with the accompanying drawings, of which:

• 1 Fig. 12 is a view illustrating an electric brake system according to a first embodiment;
• 2 Fig. 12 is a view illustrating a pressure-feeding device according to the first embodiment;
• 3 Fig. 12 is a view illustrating an electric brake system according to a second embodiment;
• 4 Fig. 12 is a view illustrating a pressure-feeding device according to the second embodiment;
• 5 Fig. 12 is a view illustrating an electric brake system according to a third embodiment;
• 6 Fig. 12 is a view illustrating a pedal operator according to the third embodiment;
• 7 Fig. 12 is a view illustrating an electric brake system according to a fourth embodiment;
• 8th Fig. 12 is a view illustrating a pedal operator according to the fourth embodiment;
• 9 Fig. 12 is a view illustrating an electric brake system according to a fifth embodiment;
• 10 Fig. 14 is a view illustrating an electric brake system according to a sixth embodiment;
• 11 12 is an enlarged view illustrating a pedal operator according to the sixth embodiment;
• 12 Fig. 14 is an enlarged view illustrating a pressure-feeding device according to the sixth embodiment;
• 13 12 is a view illustrating an electric brake system according to a seventh embodiment;
• 14 Fig. 14 is a view illustrating an electric brake system according to an eighth embodiment;
• 15 Fig. 14 is an enlarged view illustrating a pressure-feeding device according to the eighth embodiment;
• 16 12 is a view illustrating an electric brake system according to a ninth embodiment;
• 17 Fig. 12 is a view illustrating a modified example of the electric brake system according to the ninth embodiment; and
• 18 14 is a view illustrating an electric brake system according to a tenth embodiment.

DETAILED DESCRIPTION

The present disclosure will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. Example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art. In describing the present disclosure, when it is determined that a detailed description of commonly used technologies or structures related to the embodiments of the present disclosure may unnecessarily obscure the clarity of the subject matter of the disclosure, the detailed description may be omitted and parts may be omitted of the elements may be exaggerated to facilitate understanding.

1 12 is a view illustrating an electric brake system according to a first embodiment, and 2 12 is a view illustrating a pressure-feeding device 200 according to the first embodiment. According to the 1 and 2 For example, an electric brake system according to the first embodiment includes a pedal operator 100 that sends a braking intention to an electronic control unit (ECU), a reservoir 30 that stores working fluid, and a brake pressure regulator 300 that is controlled by a pressure supply device 200 that is hydraulically connected to a wheel brake is, is pressed. The brake pressure regulator 300 connects the pressure supply device 200 and the wheel brake via an inlet valve V10. The brake pressure regulator 300 includes first and second hydraulic circuits S1 and S2 which connect the wheel brake directly or indirectly to the reservoir 30 through the use of an outlet valve V20, the first and second hydraulic circuits S1 and S2 being configured to be hydraulically independent of each other operate and thus, even if one of the first and second hydraulic circuits S1 and S2 fails, the other of them operates normally.

The wheel brake 20 may include a caliper pressurized by the working fluid and a wheel braked by the caliper. The wheel brake unit 20 is pressurized by the working fluid transmitted to the wheel brake unit, thereby generating a braking force for the vehicle by braking the wheel. The reservoir 30 is a device configured to store the working fluid and supply the working fluid to the brake system. The tank 30 may correspond to a storage tank having an inlet disposed in the upper part to allow the working fluid to be additionally supplied from the outside. The wheel brake 20 may include first to fourth wheel brakes 21, 22, 23 and 24, the wheel brake 20 being any one of FL, FR, RL and RR arranged on the right and left sides of the front and rear wheels of the vehicle is.

The reservoir 30 is a device configured to store the working fluid and supply the working fluid to the brake system. The tank 30 may correspond to a storage tank having an inlet disposed in the upper part to allow the working fluid to be additionally supplied from the outside. A canister displacement sensor 150 having a main sensor connected to a first power grid and a second sensor connected to a second power grid may be attached to the canister 30, with the second sensor being a redundant sensor.

The tank 30 may be provided with a first tank chamber 31 and a second tank chamber 32 connected to the pair of hydraulic circuits S1 and S2, respectively, and a third tank chamber 33 connected between the first tank chamber 31 and the second tank mer 32 is arranged, wherein the third reservoir chamber 33 can be connected to pump chambers 224 and 225 of the pressure supply device 200.

The pedal operator 100 may provide a reaction force according to the pedaling force applied to the pedal 10 by the user. In addition, the pedal operator 100 may provide a reaction force according to a user's force to release the pedaling force applied to the pedal 10 . Accordingly, since the pedal operator 100 provides a reaction force compensated for compensating for the user's pedaling force or releasing force, the user finely adjusts the braking force as intended.

The pedal operator 100 includes a piston 111 connected to the pedal 10, a housing 112 configured to form a space in which the piston 111 moves back and forth, an elastic member 113 configured to receive a reaction force corresponding to a pedaling force of the pedal 10, and a pedal spring 114 configured to provide an elastic force to return the pedal 10 to its initial position. The elastic piece 113 may be formed of rubber, and the precise shape of the elastic piece 113 may vary according to the design method.

Pedal operator 100 may include pedal displacement sensors 120a and 120b that measure the user's braking intent. The pedal operator 100 may be physically integrated into a valve block of the brake pressure regulator 300, and the pedal displacement sensors 120a and 120b may be directly and integrally connected to the electronic control unit.

The pedal operator 100 may be connected to the pedal 10 via an input rod 11 . One side of the input rod 11 may be connected to the pedal 10 so as to be linearly moved according to the displacement of the pedal 10. However, since the input rod 11 is connected to a point remote from the axis of rotation of the pedal 10, slight up and down movement may occur.

The shape of the elastic member 113 shown in the drawings is merely an embodiment capable of providing an elastic force to the piston 111, and thus the elastic member 113 may have various shapes as long as it is able to to store elastic force by deformation. For example, the elastic member 113 may be formed of a coil spring or a leaf spring.

The pedal spring 114 is elastically deformed as the pedal 10 advances, and the pedal spring 114 is elastically restored as the pedal is retracted, providing a restoring force to the pedal 10 . The pedal spring 114 may provide a restoring force such that the pedal 10 is returned to its original position when the user removes pedaling force from the pedal 10 .

The pedal operator 100 may be provided separately from a brake pressure supplying device. For example, the braking pressure can be supplied only from the pressure supplying device 200, which will be described later, and the pedaling force of the pedal 10 is transmitted only to the pedal operator 100, while the pedal operator 100 cannot directly generate the braking force. In other words, the pedal power unit connected from the pedal 10 to the pedal operator 100 and the hydraulic unit connected from the hydraulic pressure generating actuator 200 to the wheel brakes FR, FL, RR and RL can be hydraulically separated from each other. The term "hydraulically isolated" includes a meaning that the pedaling force of the pedal 10 is not directly connected through the working fluid to the wheel brakes FR, FL, RR, and RL.

The pedal force unit and the hydraulic unit are mechanically separated from each other. The term "mechanically isolated" includes a meaning that energy transfer using the mechanical element or hydraulic pressure does not occur between the pedal force and the hydraulic unit. The pedal power unit and the hydraulic unit are electrically connected through the pedal displacement sensors 120a and 120b and the electronic control unit ECU (not shown).

However, that the pedal power unit and the hydraulic unit are mechanically separate from each other does not mean that the pedal power unit and the hydraulic unit are not structured as a single unit in which they are mechanically combined with each other. That is, to reduce weight and volume, the pedal power unit and the hydraulic unit can be configured as a single unit.

The electric brake system according to the first embodiment can perform the redundancy function by having the redundancy components.

In general, a braking system in the electric mode usually uses a method in which a master cylinder is hydraulically connected to a wheel brake is connected to form a minimum brake pressure even during abnormal operation. That is, in the backup mode, the shut-off valve is opened and the hydraulic pressure of the master cylinder can be directly introduced into the wheel brake, and thus the emergency brake pressure can be formed.

However, in the first embodiment, without the master cylinder, the electric brake system can perform the normal braking function during an abnormal operation of the electronic control unit or the pressure applying device 200. That is, by removing the master cylinder, the number, weight and volume of the components can be reduced. In addition, by removing the master cylinder, the flow path can be simplified and noise can be reduced. Furthermore, even in the backup mode, the same braking pressure as in the normal state can be generated.

The pressure-feeding device 200 includes a driver 201 and a piston pump unit 202 actuated by the energy of the driver 201 . The driver 201 generates power by the electric signals of the pedal displacement sensors 120a and 120b, and the piston pump unit 202 generates the hydraulic pressure by the power of the driver 201 to provide the hydraulic pressure for the wheel brakes FR, FL, RR and RL.

At this time, the pedal displacement sensors 120a and 120b obtain the displacement of the pedal 10 and send an electric signal to the electronic control unit (ECU). The electronic control unit (ECU) identifies the brake pressure requested by the user by analyzing the signals from the pedal displacement sensors 120a and 120b. The electronic control unit (ECU) issues a signal to control the piston pump unit 202 and the various valves to obtain the required braking pressure.

The driver 201 includes a motor 210 that generates torque by supplying energy. The motor is a device for generating torque by a signal output from an electronic control unit (ECU), and can generate the torque in a forward direction or a reverse direction. The angular speed and angle of rotation of the motor can be precisely controlled. Such a motor is a known technique and hence a detailed description thereof will be omitted.

The motor 210 includes a stator 211 and a rotor 212. The stator 211 may be provided in a donut or donut shape to form a hollow portion. The rotor 212 may be provided in a hollow cylindrical shape and placed in the hollow portion of the stator 211 .

The driver 201 contains at least one magnetic body 213 which generates the torque of the motor 210. The magnetic body 213 can be arranged on the outer peripheral surface of the rotor 212 and rotate together with the rotor 212 . A gap is formed between the stator 211 and the magnetic body 213 to allow the rotor 212 to rotate smoothly.

Driver 201 may further include a ball bearing 216 disposed between motor 210 and rotor 212 . The ball bearing 216 may be installed on the inner peripheral surface of the hollow portion of the motor 210 to guide the rotation of the rotor 212.

The driver 201 includes an energy transmitter that converts the rotary motion of the motor 210 into linear motion and transmits the linear motion to the piston 222 of the pressure transfer device. The energy transmitter may include a pin portion 214 coupled to the rotor 212 for rotation with the rotor 212 and a rotary shaft portion 215 connected to the pin portion 214 for rotation. For example, the rotor 212 is provided in a hollow cylindrical shape, and a surface is arranged at one end of the rotor 212 so that the pin part 214 is coupled to the end surface of the rotor 212 .

The piston pump unit 202 includes a cylinder block, a pressure supply cylinder 220 in which a bore 221 is formed in the cylinder block, a piston rod 223 which linearly reciprocates by meshing with the rotating shaft part 215, a pressure supply piston 222 connected to the piston rod 223 and is accommodated in the bore 221 to be slidably moved, and chambers 224 and 225 which are arranged between the pressure-supply piston 222 and the pressure-supply cylinder 220.

The pressure feed cylinder 220 may be connected to one side of the engine 210 . Alternatively, the pressure feed cylinder 220 may be formed integrally with the motor 210. The pressure feed cylinder 220 forms the bore 221 which is a hollow area for receiving the pressure feed piston 222 therein. Bore 221 may extend parallel to the axis of rotation of motor 210 . That is, the pressure-applying piston 222 can linearly reciprocate in a direction parallel to the axis of rotation of the motor 210 .

The piston rod 223 may be a nut part screw-coupled to the rotating shaft part 215 . For example, the rotating shaft part 215 forms a spindle with the outer peripheral surface formed with a screw thread. The piston rod 223 includes a hollow portion, and an inner peripheral surface of the hollow portion is formed with a thread groove that engages with the screw thread of the rotating shaft portion 215 . That is, the rotary motion of the rotary shaft part 215 can be converted into a linear reciprocating motion of the piston rod 223 .

The rotary shaft member 215 and the piston rod 223 may be a ball screw type coupling in which a rolling ball is interposed between the screw thread and the screw groove. One side of the pressure feed cylinder 220 is opened to communicate with the bore 221 . The piston rod 223 can enter the opening of the pressure supply cylinder 220 .

An inner diameter of the opening of the pressure-supply cylinder 220 is smaller than an inner diameter of the bore 221, and an outer diameter of the pressure-supply piston 222 may be larger than an outer diameter of the piston rod 223. Accordingly, it is possible to prevent the pressure-feeding piston 222 from deviating to the outside of the bore 221 .

The piston pump unit 202 can be provided with a double-action piston. That is, the piston pump assembly 202 may include a first pump chamber 224 located forward of the pressure supply piston 222 and a second pump chamber 225 located aft of the pressure supply piston 222 .

The first pump chamber 224 and the second pump chamber 225 can be connected to one or more wheel brakes FR, FL, RR and RL to supply the hydraulic pressure.

When the pressure supply piston 222 moves forward, hydraulic pressure may be generated in the first pump chamber 224 or negative pressure may be generated in the second pump chamber 225 . Conversely, when the pressure supply piston 222 moves backward, negative pressure may be generated in the first pump chamber 224 or hydraulic pressure may be generated in the second pump chamber 225 . At this time, it is determined by the electronic control unit (ECU) whether to supply the braking pressure to the wheel brakes FR, FL, RR and RL using the hydraulic pressure of the chamber, or to release the braking pressure using the negative pressure of the chamber. wherein the determination is performed by controlling the valves.

The first pump chamber 224 is divided by the front end of the pressure-supply cylinder 220 and the pressure-supply piston 222, and the volume of the first pump chamber 224 is changed according to the movement of the pressure-supply piston 222. The second pump chamber 225 is divided by the rear end of the pressure-supply cylinder 220 and the pressure-supply piston 222, and the volume of the second pump chamber 225 is changed according to the movement of the pressure-supply piston 222.

The pressure-supply piston 222 may be configured such that a first effective area that forms the hydraulic pressure in the first pump chamber 224 is larger than a second effective area that forms the hydraulic pressure in the second pump chamber 225 . That is, the second effective area can be obtained by subtracting the cross-sectional area of the piston rod 223 from the cross-sectional area of the pressure-supply piston 222 .

Piston pump assembly 202 may further include a first sealing member 226 that prevents working fluid from leaking from second pump chamber 225 along piston rod 223 . The first sealing member 226 may be installed on the inner peripheral surface of the opening of the pressure feed cylinder 220 . For example, an annular depressed groove is arranged in the inner peripheral surface of the opening of the pressure-feeding cylinder 220, and an annular first sealing part 226 may be fitted into the depressed groove.

The piston pump unit 202 may further include a second sealing member 227 that seals the first pump chamber 224 and the second pump chamber 225 . The second sealing part 227 can be fixed on the outer peripheral surface of the pressure-feeding piston 222 and move together with the pressure-feeding piston 222 . For example, a flange shape may be provided at the front end and a rear end of the pressure-feeding piston 222, respectively, and an annular second sealing part 227 may be fitted between the two flange shapes.

That is, the hydraulic pressure or the negative pressure of the first pump chamber 224, which is generated by the forward or backward movement of the pressure supply piston 222, is blocked by the second sealing part 227, and thus the hydraulic pressure or the negative pressure does not leak into the second pump chamber 225 The hydraulic pressure or the negative pressure of the second pump chamber 225 caused by the forward or reverse operation generated by the movement of the pressure-feeding piston 222 is blocked by the first sealing member 226, and thus the hydraulic pressure or the negative pressure does not leak to the outside of the pressure-feeding cylinder 220.

Brake pressure regulator 300 may have an inlet line 310 connecting pump chambers 224 and 225 to wheel brake 20, an outlet line 320 connecting wheel brake 20 to reservoir 30, and a pump reservoir line 330 connecting reservoir 30 to pump chambers 224 and 225 , contain. That is, each of the pair of hydraulic circuits S1 and S2 includes the inlet line 310 with an analog, normally open inlet valve V10, which connects the pressure supply device 200 to the four wheel brakes 20, and the outlet line 320 with an analog, normally open outlet valve V20, which connects the four wheel brakes 20 directly or indirectly to the container 30. The intake valve V10 may include first through fourth intake valves V11, V12, V13, and V14, and the exhaust valve V20 may include first through fourth exhaust valves V21, V22, V23, and V24.

The inlet line 310 may include a first inlet line 311 allowing only one-way flow from the first pump chamber 224 to the inlet valves V11 and V12 of the first hydraulic circuit S1 through a check valve Slla, a second inlet line 312 allowing only one-way flow from the second pump chamber 225 to the inlet valves V13 and V14 of the second hydraulic circuit S2 through a check valve 312a, a third inlet line 313 which only allows one-way flow from the second pump chamber 225 to the inlet valves V11 and V12 of the first hydraulic circuit S1 through a check valve 313a, and a fourth inlet line 314, allowing only one-way flow from the first pump chamber 224 to the inlet valves V13 and V14 of the second hydraulic circuit S2 through a check valve 314a.

The check valves 311a, 312a, 313a and 314a arranged in the respective intake passages 310 can be maintained in a state in which they are pressed by the elastic force so that leakage flow from the first pump chamber 224 or the second Pump chamber 225 to the wheel brake 20 is prevented.

The independence of the pair of hydraulic circuits S1 and S2 can be implemented by the check valves 311a, 312a, 313a and 314a, which are arranged in the inlet line 310 connecting the first and the second pump chambers 224 and 225 of the pressure supply device 200 with the inlet valves V11 , V12, V13 and V14 of the first hydraulic circuit S1 or the second hydraulic circuit S2 connects.

The exhaust line 320 may include first and second exhaust lines 321 and 322 . At this time, the first exhaust pipe 321 can connect the first and second exhaust valves V21 and V22 to the canister 30 , and the second exhaust pipe 322 can connect the third and fourth exhaust valves V23 and V24 to the canister 30 .

The intake valve V10 and the exhaust valve V20 work as a coil or a set of coils, and the intake valve V10 and the exhaust valve V20 can be connected to two different power grids so that the intake valve V10 and the exhaust valve V20 is operated by the other power grid, even if that a power grid fails. Furthermore, the inlet valve V10 and the outlet valve V20 can be connected to two different energy networks in order to prevent simultaneous closing caused by a malfunction. The electrical operation of the intake valve V10 is independent of the electrical operation of the exhaust valve V20, and thus it may be possible to prevent malfunction-caused simultaneous closing.

According to the disclosure, regarding the intake valve V10, the check valve configured to prevent backflow need not be arranged in parallel, the backflow occurring when the pressure of the pressure supply device 200 is lower than the pressure of the wheel brake. In the same way, regarding the exhaust valve V20, the check valve configured to prevent back flow need not be arranged in parallel, the back flow taking place when the pressure of a discharge port is higher than the pressure of the wheel brake.

The pump reservoir line 330 may include a first pump reservoir line 331 allowing only one-way flow from the reservoir 30 to the first pump chamber 224 by having a check valve 331a, a second pump reservoir line 332 allowing only one-way flow from the reservoir 30 to the second pump chamber 225 by having a check valve 332a, a third pump reservoir line 333 allowing only one-way flow from the first pump chamber 224 to the reservoir 30 by having a check valve 333a, the third pump reservoir line 333 being provided with a first bleed valve V31, and a fourth pump reservoir line 334 allowing only one-way flow from the second pump chamber 225 to the reservoir 30 by having a check valve 334a wherein the fourth pump reservoir line 334 is provided with a second drain valve V32 included.

Regarding the pump reservoir line 330 configured as described above, the first and second pump chambers 224 and 225 can be hydraulically connected to the reservoir 30 independently by using the first bleed valve V31, which controls the opening and closing of the third pump reservoir line 333, and the second bleed valve V32, that controls the opening and closing of the fourth pump reservoir line 334 may be used.

The pedal displacement sensors 120a and 120b detect the displacement of the pedal 10 and send an electrical signal to the electronic control unit (ECU). The electronic control unit (ECU) identifies the brake pressure requested by the user by analyzing the signals from the pedal displacement sensors 120a and 120b. The electronic control unit (ECU) issues a signal to control the piston pump unit 202 and the various valves to obtain the required braking pressure.

Hydraulic circuit pressure sensors 130a and 130b may be provided to detect the hydraulic pressure of the hydraulic circuit 400. For example, the hydraulic circuit pressure sensors 130a and 130b include a first hydraulic circuit pressure sensor 130b connected to a first hydraulic flow path 230 to detect hydraulic pressure and a second hydraulic circuit pressure sensor 130a connected to a second hydraulic flow path 231. to measure the hydraulic pressure. The first hydraulic circuit pressure sensor 130b may be arranged between the first pump chamber 224 and the first and second intake valves V11 and V12, and the second hydraulic circuit pressure sensor 130a may be arranged between the second pump chamber 225 and the third and fourth intake valves V13 and V14 .

If the two inlet valves V11 and V12 contained in the first hydraulic circuit S1 are open or if the pressures of the wheel brakes 21 and 22 are different, some inlet valve V11 is closed and the other inlet valve V12 is open. Accordingly, the first hydraulic circuit pressure sensor 130b can measure a wheel pressure applied to any one of the wheel brakes 21 and 22 connected to the first hydraulic circuit S1. In addition, regarding the second hydraulic circuit S2, a single second hydraulic circuit pressure sensor 130a can measure wheel pressure of both wheel brakes 23 and 24.

Driver displacement sensors 140a and 140b may be provided to detect the displacement of the driver 201. For example, driver displacement sensors 140a and 140b can detect the angle of rotation of motor 210 . Alternatively, the driver displacement sensors 140a and 140b may detect the current, voltage, or torque of the driver 201.

The tank displacement sensor 150 may be provided to detect the level of the tank 300 .

The electronic control unit (ECU) can have a redundancy function. To this end, the driver 201 may include a first power grid connected to the first driver 201a and a second power grid connected to the second driver 201b. In this case, the first driver 201a and the second driver 201b may be the stator 211 of the motor 210 operated by independent signals.

The electronic control unit (ECU) may include a first electronic control unit connected to the first power grid and a second electronic control unit connected to the second power grid. The second power grid can be configured to operate selectively or in tandem with the first power grid. Thus, when the first electronic control unit operates abnormally in a state in which the second power grid is configured to be operated selectively with the first power grid, the second power grid can be operated by the signal of the second electronic control unit, and thus the operation needs of the driver 201 not to be stopped. On the other hand, when the second electronic control unit operates abnormally, the first power grid can be operated by the signal from the first electronic control unit, and thus the operation of the driver 201 need not be stopped.

When the first electronic control unit operates abnormally, the electronic control unit (ECU) can prevent the abnormal operation of the driver 201 by blocking the signal of the first electronic control unit and by allowing the second power grid to be operated by the signal of the second electronic unit . On the other hand, when the second electronic control unit operates abnormally, the electronic control unit (ECU) can prevent the abnormal operation of the driver 201 by blocking the signal of the second electronic control unit and by allowing the first power grid to operate by the signal of the first electronic unit to become.

Furthermore, one or more solenoid valves controlled by the electronic control unit may include two coils each connected to the first and second electronic control units. One of the two coils can be operated by the second electronic control unit when the first electronic control unit is abnormal, and the other coil can be operated by the first electronic control unit when the second electronic control unit is abnormal.

The electronic control unit (ECU) may include the pedal displacement sensors 120a and 120b that detect the displacement of the pedal, the hydraulic circuit pressure sensors 130a and 130b that detect the hydraulic pressure of the first or second hydraulic circuit S1 and S2, and the driver displacement sensors 140a and 140b that detect the amount of rotation of the driver 201 included. The pedal displacement sensors 120a and 120b, the hydraulic circuit pressure sensors 130a and 130b, and the driver displacement sensors 140a and 140b each include a main sensor and an auxiliary sensor. The auxiliary sensor may be a redundancy sensor configured to operate when the main sensor operates abnormally.

According to the first embodiment, the electric braking system may be arranged in an integrated parking brake (IPB) type, in which one or more wheel brakes 20 associated with electrically actuated parking brakes are provided, the one or more wheel brakes 20 with the first and the second power grid, which are operated independently of each other, and thus a wheel brake, which is selectively operated by the electronic control unit, and a parking brake can be integrated.

the 3 until 18B each show an electric brake system according to a second to tenth exemplary embodiment. In the following description of the electric brake system according to the second to tenth embodiments, the same reference numerals used in the description of the electric brake system according to the first embodiment refer to the same elements unless specifically stated otherwise, and thus the description thereof will be made omitted to avoid repetition of description.

According to the 3 and 4 For example, regarding an electric brake system according to the second embodiment, there is provided a pressure supply device 200-1 of a different type from the pressure supply device 200 according to the first embodiment, and the third pump tank line 333 provided with the check valve 334a and the first drain valve V31, and the fourth pump tank line 334 provided with the check valve 334a and the second drain valve V32 can be omitted.

A piston pump unit 202 - 1 of the pressure-feeding device 200 - 1 is provided such that piston rods 223 and 228 are connected to opposite sides of a pressure-feeding piston 222 .

According to 3 On one side of the pressure supply piston 222, a first piston rod 223 having a screw/nut coupling with a rotary shaft part 215 extends in a direction of a second chamber 225, and on the other side thereof, a second piston rod 228 extends through a Pressure feed cylinder 220 passes through, in a first chamber 224.

The pressure feed cylinder 220 has a first port that communicates with a bore 221 that receives the pressure feed piston 222 and through which the first piston rod 223 passes, and a second port that communicates with the bore 221 and through which the second piston rod 228 passes.

The pressure supply piston 222 may be configured such that a first effective area that forms the hydraulic pressure in the first pump chamber 224 is the same as a second effective area that forms the hydraulic pressure in the second pump chamber 225 . That is, the cross-sectional area of the first piston rod 223 may be the same as the cross-sectional area of the second piston rod 228 .

The piston pump unit 202 - 1 may further include a third sealing member 229 that prevents working fluid of the first chamber 224 from leaking outside of the pressure feed cylinder 220 along the second piston rod 228 . The third sealing member 229 may be installed on the inner peripheral surface of the second port of the pressure feed cylinder 220 . For example, a depressed groove having an annular shape may be arranged in the inner peripheral surface of the second opening of the pressure-feeding cylinder 220, and the third sealing part 229 having the annular shape may be fitted into the depressed groove.

In a third embodiment, according to the 5 and 6 the pedal operator 100 according to the second embodiment may be divided into a simulator unit 400 and a cylinder unit 500. In particular, the cylinder unit 500 connected to the pedal 10 is from the simulator unit 400 configured to provide a reaction force corresponding to the pedaling force by being connected to the cylinder unit 600, unlike the system in which a pedal operator 100 is connected to the pedal 10 and at the same time the pedal operator 100 serves as a pedal simulator .

The pedal operators 400 and 500 include the cylinder unit 500 provided with a first piston 512 connected to the pedal, and the simulator unit 400 hydraulically connected to the cylinder unit 500 to provide a reaction force corresponding to the pedaling force of the pedal . Pedal operators 400 and 500 may be hydraulically independent of brake pressure regulator 300 . The movement of a pressing member 522 can be measured by a pedal displacement sensor 120b.

The pedal operators 400 and 500 can include the cylinder unit 500 and the simulator unit 400, which is hydraulically connected to the cylinder unit 500 to provide a reaction force corresponding to the pedaling force of the pedal, the cylinder unit 500 having the first piston 512 connected to the pedal, a cylinder chamber 511, the volume of which is variable by the first piston 512, and a pressure chamber 521, the volume of which is variable by the pressure part 522 may contain.

The simulator unit 400 includes a simulator chamber 411 connected to a housing 410 and the cylinder chamber 511, a piston 412 housed in the housing 410 and configured to reduce or expand the simulator chamber 411, an elastic member 413 that configured to apply an elastic force to the piston 412, and a sealing member 414 configured to seal the simulator chamber 411.

In the third embodiment, the cylinder chamber 511 is not directly connected to the hydraulic circuit. Therefore, the inside of the cylinder chamber 511 is provided with an empty space or communicated with the pressure chamber 521 to temporarily store the working fluid. Accordingly, pedal operators 400 and 500 may be hydraulically independent of brake pressure regulator 300 . When the first piston 512 moves forward, the cylinder chamber 511 can discharge the air stored therein into a narrow flow path, thereby generating the resistance and providing pedal feel.

The cylinder unit 500 includes a pedal spring 513 connected to the input rod 11 to provide a retracting force to the first piston 512, wherein the pressing member 522 can be pressurized and then retracted by the first piston 512 when the first piston 512 is retracted becomes.

The first piston 512 is connected to the pedal 10 via the input rod 11 to receive a forward force in a direction in which the cylinder chamber 511 is retracted. The pressing member 522 receives a forward force in a direction in which the pressurizing chamber 521 is retracted through the locking projection 12 arranged on the input rod 11 . Therefore, the forward and backward movements of the first piston 512 and the pressing part 522 can be performed independently.

In the third embodiment, a third tank line 353 can be branched into a fourth tank line 354 connecting the pressure chamber 521 to the simulator unit 400 and a fifth tank line 355 connecting the pressure chamber 521 to the tank 30 . A check valve 355a and a second tank valve V42 may be installed in the fifth tank line 355 in parallel with each other.

In a fourth embodiment, according to the 7 and 8th further, a first reservoir line 351 connecting a cylinder chamber 511 to a reservoir 30, and a second reservoir line 352 having a check valve 352a allowing only one-way flow from the reservoir 30 to the cylinder chamber 511 may be provided. A normally closed first tank valve V41 may be installed in the first tank line 351 .

Furthermore, a third exhaust line 323 connecting the cylinder chamber 511 to exhaust valves V23 and V24 of the second hydraulic circuit S2 and a first cylinder line 341 connecting from the cylinder chamber 511 to a second intake line 312 may be provided.

A first check valve 312a and a second check valve 312b, which are arranged in series to prevent backflow, may be arranged in the second inlet line 312 connected from the pressure supply device 200 to inlet valves V13 and V14 of the second hydraulic circuit S2. A check valve 314a that prevents reverse flow may be provided in the first cylinder line 341 connected from the cylinder chamber 511 to a position between the first check valve 312a and the second check valve 312b.

According to 9 For example, an electric brake system according to a fifth embodiment may be configured such that a first dump valve V31 and a second dump valve V32 are provided in addition to the electric brake system according to the fourth embodiment.

A third pump reservoir line 333 configured to allow only one-way flow from the first pump chamber 224 to the reservoir 30 by having a check valve 333a and being provided with the first bleed valve V31, and a fourth pump reservoir line 334 configured is that it allows only one-way flow from the second pump chamber 225 to the reservoir 30 by having a check valve 334a and being provided with the second drain valve V32 may be provided. Therefore, the first and second pump chambers 224 and 225 can be hydraulically connected independently of each other.

The first dump valve V31 and the second dump valve V32 can open or close the third pump reservoir line 333 and the fourth pump reservoir line 334, respectively.

According to the 10 until 12 An electric brake system according to a sixth embodiment may include: a third pump reservoir line 333 configured to allow only one-way flow from the first pump chamber 224 to the reservoir 30 by having a check valve 333a, and a fourth pump reservoir line 334 configured to allow only one-way flow from the second pump chamber 225 to the reservoir 30 by having a check valve 334a, wherein a third bleed valve V33 may be disposed in a fifth pump reservoir line 335 where the third pump reservoir line 333 and the fourth pump reservoir line 334 join . Therefore, it is possible to regulate the flow of the working fluid flowing in the fourth pump tank line 334 and the fifth pump tank line 335 by using a single third drain valve V33.

The electric brake system according to the sixth embodiment may further include a second piston 532 configured to divide a cylinder chamber of the cylinder unit 500-1 into a first cylinder chamber 514 and a second cylinder chamber 531, the first cylinder chamber 514 being connected to a second hydraulic circuit S2 by a third outlet line 323 or a first cylinder line 341, and the second cylinder chamber 531 is connected to a first hydraulic circuit S1 through a fourth outlet line 324 or a cylinder line 342.

First check valves 311a and 312a and second check valves 311b and 312b configured to prevent backflow may be installed in a first inlet pipe 311 and a second inlet pipe 312 leading from the pressure supply device 200 to the inlet valve V10 of the first and second hydraulic circuits S1 and S2 are connected. A check valve 341a configured to prevent back flow to the first cylinder chamber 514 may be arranged in the first cylinder line 341 connected from the first cylinder chamber 514 to the second intake line 312 . A check valve 342a configured to prevent back flow to the second cylinder chamber 531 may be arranged in the second cylinder line 342 connected from the second cylinder chamber 531 to the first intake line 311 .

According to 13 An electric brake system according to a seventh embodiment may include: a third outlet line 323 configured to allow only one-way flow from inlet valves V13 and V14 of the second hydraulic circuit S2 to the cylinder chamber 511 through a check valve 323a, and a fourth outlet line 324 configured to allow only one-way flow from intake valves V11 and V12 of the first hydraulic circuit S1 to the cylinder chamber 511 through a check valve 324a. It is possible to block the flow of the fluid flowing from the cylinder chamber 511 to the exhaust valve V20 through the third exhaust line 323 and the fourth exhaust line 324 by adding the check valves 323a and 324a to the third exhaust line 323 and the fourth exhaust line 324 .

According to the 14 and 15 For example, an electric brake system according to an eighth embodiment may further include: a first connection line 361 allowing only one-way flow from a third inlet line 313 to a first inlet line 311 through a check valve 361a, and a second connection line 362 allowing only one-way flow from a fourth inlet line 314 to the first connecting line 361 through a check valve 362a, and a third connecting line 363 arranged in parallel with a second inlet line 312, wherein a normally-closed first control valve V51 can be installed in the first connecting line 361 and a normally-closed second control valve V52 may be installed in the third connection line 363.

In the same manner as the above-described embodiments, the intake line 310 includes: a first intake line 311 configured to allow only one-way flow from a first pump chamber 224 to an intake valve of the first hydraulic circuit S1 through a check valve, a second inlet line 312 configured to allow only one-way flow from a second pump chamber 225 to an inlet valve of the second hydraulic circuit S2 through a check valve, a third inlet line 313 configured to only one-way flow from the second pumping chamber 225 to the inlet valve of the first hydraulic circuit S1 through a check valve, and a fourth inlet line 314 configured to only allow one-way flow from the first pumping chamber 224 to the inlet valve of the second hydraulic circuit S2 through a check valve.

According to the 16 and 17 In a ninth embodiment, the electric braking system may be operated in an integrated parking brake (IPB) manner, wherein a wheel brake associated with a parking brake that is electrically operated is provided, and the wheel brake is provided with the first and second power grids is connected, which are operated independently, and thus the wheel brake and the parking brake are integrated. The wheel brake connected to the parking brake may be a pair of rear wheels RR and RL.

According to the ninth embodiment, the electric brake system may further include a normally-open cylinder valve V61 interposed between the outlet valves V23 and V24 of the second hydraulic circuit S2 connected to the pair of front wheels FR and FL and the cylinder chamber 511.

The third inlet valve V13, the fourth inlet valve V14, the first outlet valve V21, the second outlet valve V22, the third outlet valve V23, the fourth outlet valve V24, the drain valve V31, the first tank valve V41 and the second tank valve V42 are connected to the first energy network. The cylinder valve V61 and the first intake valves V11 and V12 of the first hydraulic circuit S1 connected to the pair of rear wheels RR and RL and the parking brake may be connected to the second power grid.

According to 18 in a tenth embodiment, an electronic control unit (ECU) includes a first electronic control unit connected to a first power grid and a second electronic control unit connected to a second power grid, wherein some of the intake valves V10 or some of the exhaust valves V20 are connected to the second energy network can be connected. For example, two coils may be wound only at the second intake valve V12, the fourth intake valve V14, the first exhaust valve V21 and the third exhaust valve V23, and thus one coil is connected to the first power grid and the other coil is connected to the second power grid.

In this embodiment, at least the general braking function can be activated by the inlet and outlet valves connected to the second power grid even if the first power grid fails. Accordingly, it may be possible to reduce waste of material and material cost by reducing the number of valves connected to the second power grid.

As can be seen from the above description, the electric brake system is configured to allow the other hydraulic circuit to generate brake pressure even if one of the first and second hydraulic circuits is abnormal, and thus the electric brake system is stably operated. by operating the other hydraulic circuit even if one of the hydraulic circuits fails.

In addition, the braking system 8 uses normally-open intake valves and exhaust valves, and thus it is possible to implement an effective and simplified hydraulic circuit.

Although a few embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.

Reference List

10

pedal

12

locking tab

30

container

32

second reservoir chamber

V11

first intake valve

V13

third intake valve

V21

first exhaust valve

V23

third exhaust valve

V31

first drain valve

V33

third drain valve

V42

second tank valve

V52

second control valve

100

pedal operator

112

Housing

114

pedal spring

120b

pedal displacement sensor

130b

Hydraulic circuit pressure sensor

140b

driver offset sensor

200

pressure delivery device

202

piston pump unit

225

second pump chamber

300

brake pressure regulator

311

first inlet line

313

third inlet line

320

outlet line

322

second outlet line

324

fourth outlet line

331

first pump reservoir line

333

third pump reservoir line

335

fifth pump reservoir line

341

first cylinder line

350

vessel line

352

second tank line

354

fourth tank line

11

input bar

20

wheel brake

31

first reservoir chamber

33

third tank chamber

V12

second inlet valve

V14

fourth intake valve

V22

second exhaust valve

V24

fourth exhaust valve

V32

second drain valve

V41

first reservoir valve

V51

first control valve

V61

cylinder valve

111

Pistons

113

elastic part

120a

pedal displacement sensor

130a

Hydraulic circuit pressure sensor

140a

driver offset sensor

150

Bin displacement sensor

201

driver

224

first pump chamber

230

Pistons

310

inlet line

312

second inlet line

314

fourth inlet line

321

first outlet line

323

third outlet line

330

pump reservoir line

332

second pump reservoir line

334

fourth pump reservoir line

340

cylinder line

342

second cylinder line

351

first tank line

353

third tank line

355

fifth tank line

360

connection line

362

second connection line

400

simulator unit

411

simulator chamber

413

elastic part

500

cylinder unit

512

first piston

514

first cylinder chamber

522

pressure part

532

second piston

S2

second hydraulic circuit

361

first connection line

363

third connection line

410

Housing

412

Pistons

414

sealing part

511

cylinder chamber

513

pedal spring

521

pressure chamber

531

second cylinder chamber

S1

first hydraulic circuit

Claims (23)

An electric braking system, comprising: a pedal operator (100) connected to a brake pedal (10) and configured to communicate a braking intent to an electronic control unit send; a reservoir (30) configured to store a working fluid; a pressure supply device (200) provided with an energizing driver (201) and configured to generate hydraulic pressure for a plurality of wheel brakes (21, 22, 23, 24); and a brake pressure regulator (300) configured to regulate hydraulic pressure generated by the pressure supply device (200) and transmitted to the wheel brake (21, 22, 23, 24), the brake pressure regulator (300) having a first hydraulic circuit (S1) hydraulically connected to two wheel brakes (21, 22) and a second hydraulic circuit (S2) hydraulically connected to the other two wheel brakes (23, 24), the first hydraulic circuit (S1) and the second hydraulic circuit (S2) having a plurality of inlet lines (311, 312, 313, 314) connecting the pressure supply device (200) to each of the wheel brakes (21, 22, 23, 24) and a plurality of outlet lines (321, 322, 323, 324) connecting each of the wheel brakes (21, 22, 23, 24) to the container (30) or connecting each of the wheel brakes (21, 22, 23, 24) to the pedal operator (100), the first Hydraulic circuit (S1) and the second hydraulic circuit (S2) are hydraulically separated from each other by a n to regulate hydraulic pressure transmitted from the other hydraulic circuit to the wheel brake (21, 22, 23, 24) when one of the hydraulic circuits (S1, S2) is abnormal; wherein the plurality of inlet lines (311, 312, 313, 314) a first inlet line arranged in the first hydraulic circuit (S1) and provided with a first inlet valve (V11), a second inlet line arranged in the first hydraulic circuit (S1). and is provided with a second inlet valve (V12), a third inlet line arranged in the second hydraulic circuit (S2) and provided with a third inlet valve (V13), and a fourth inlet line arranged in the second hydraulic circuit (S2) and is provided with a fourth intake valve (V14); and the plurality of outlet lines (321, 322, 323, 324) a first outlet line arranged in the first hydraulic circuit (S1) and provided with a first outlet valve (V21), a second outlet line arranged in the first hydraulic circuit (S1). and is provided with a second outlet valve (V22), a third outlet line arranged in the second hydraulic circuit (S2) and provided with a third outlet valve (V23), and a fourth outlet line arranged in the second hydraulic circuit (S2) and is provided with a fourth outlet valve (V24), characterized in that electrical actuation of the first to fourth inlet valve (V11, V12, V13, V14) independently of electrical actuation of the first to fourth outlet valve (V21, V22, V23, V24) is controlled in such a way that simultaneous closing caused by malfunctions is prevented. Electric braking system after claim 1 , wherein the first to fourth intake valves (V11, V12, V13, V14) and the first to fourth exhaust valves (V21, V22, V23, V24) are an analog normally open valve. Electric braking system after claim 1 or 2 wherein the pressure applying device (200) has a first piston (512) actuated by receiving power and a pump chamber whose volume is variable according to a displacement of the first piston, each of the first to fourth inlet passages (311 , 312, 313, 314) further comprising a respective one of first through fourth check valves (311a, 312a, 313a, 314a) disposed and configured between the pump chamber and a respective one of the inlet valves (V11, V12, V13, V14), only allow one-way flow from the pump chamber to the inlet valve (V11, V12, V13, V14). Electric braking system after claim 2 or 3 , in which the first through fourth intake valves (V11, V12, V13, V14) are connected to two different power networks such that if one of the power networks fails, the first through fourth intake valves (V11, V12, V13, V14) through the other energy network are operated. Electrical braking system according to any of claims 2 until 4 , in which the first through fourth exhaust valves (V21, V22, V23, V24) are connected to two different power networks such that if one of the power networks fails, the first through fourth exhaust valves (V21, V22, V23, V24) through the other energy network are operated. Electrical braking system according to any of claims 3 until 5 , wherein the pumping chamber comprises a first pumping chamber arranged in front of the first piston and a second pumping chamber arranged behind the first piston, the pumping chamber further comprising: a first pump reservoir line (331) configured to connect the first pumping chamber having the reservoir (30) and provided with a check valve allowing only one-way flow from the reservoir (30) to the first pumping chamber, and a second pump reservoir line (332) configured to connect the second pump chamber to the reservoir (30) and provided with a check valve allowing only one-way flow from the reservoir (30) to the second pump chamber. Electrical braking system according to any of Claims 1 until 6 wherein the electronic control unit comprises a first electronic control unit connected to the first power grid and a second electronic control unit connected to the second power grid configured to operate selectively or together with the first power grid. Electric braking system after claim 7 wherein the pressure-feeding device (200) is operated by the second electronic control unit when the first electronic control unit is abnormal, or is operated by the first electronic control unit when the second electronic control unit is abnormal. Electrical braking system according to any of Claims 1 until 8th , further comprising: a pedal displacement sensor (120a, 120b) configured to detect a displacement of the brake pedal (10); a hydraulic circuit pressure sensor (130a, 130b) configured to detect a hydraulic pressure of the first hydraulic circuit (S1) or the second hydraulic circuit (S2); and a driver displacement sensor (140a, 140b) configured to detect an amount of rotation of the driver (201), wherein the pedal displacement sensor (120a, 120b), the hydraulic circuit pressure sensor (130a, 130b) and the driver displacement sensor (140a, 140b) each one Having a main sensor and an auxiliary sensor, wherein the auxiliary sensor is a redundancy sensor configured to operate when the main sensor is operating abnormally. Electrical braking system according to any of Claims 1 until 9 , wherein the pedal operator (100) has a first piston (512) connected to the brake pedal (10), an elastic member (413) configured to provide a reaction force corresponding to a pedaling force of the brake pedal (10), and a A pedal displacement sensor (120a, 120b) configured to measure a user's braking intention, wherein the pedal simulator (100) is hydraulically isolated from the brake pressure regulator (300). Electrical braking system according to any of Claims 6 until 10 , further comprising: a third pump reservoir line (333) configured to connect the first pump chamber to the reservoir (30) and provided with a check valve allowing only one-way flow from the first pump chamber to the reservoir (30) and a first drain valve is; and a fourth pump-reservoir line (334) configured to connect the second pumping chamber to the reservoir (30) and provided with a check valve allowing only one-way flow from the second pumping chamber to the reservoir (30) and a second bleed valve. Electric braking system after claim 11 wherein the pressure applying device (200) comprises a first piston actuated by receiving power and a pump chamber whose volume is variable by displacement of the first piston, the pump chamber including a first pump chamber located in front of the first piston and having a second pumping chamber located behind the first piston, the pumping chamber further comprising: a first pumping reservoir line (331) configured to connect the first pumping chamber to the reservoir (30) and having a check valve having only allowing one-way flow from the reservoir (30) to the first pumping chamber; a second pump reservoir line (332) configured to connect the second pump chamber to the reservoir (30) and provided with a check valve allowing only one-way flow from the reservoir (30) to the second pump chamber; the third pump reservoir line (333) provided with a first drain valve (V31); and the fourth pump reservoir line (334) provided with a second bleed valve (V32). Electrical braking system according to any of Claims 1 until 12 , in which the pedal operator (100) has a cylinder unit (500) provided with a first piston (512) connected to the brake pedal (10), and a simulator unit (400) hydraulically connected to the cylinder unit (500 ) is connected to provide a reaction force corresponding to a pedaling force of the brake pedal (10), wherein the cylinder unit (500) has a cylinder chamber (511) whose volume is variable by the first piston (512) and a pressure chamber (521), whose volume is variable by a pressure part (522). Electric braking system after Claim 13 , in which the brake pedal (10) and the first piston (512) are connected by an input rod (11). which are connected, and the pressing member (522) is movable forward and backward by a locking projection (12) arranged on the input rod (11). Electrical braking system according to any of Claims 1 until 14 , further comprising: a first tank line (353) configured to connect the tank (30), the pressure chamber (521) and the simulator unit (400), the first tank line (353) having a first tank valve (V42) and a check valve (355a) arranged in parallel with the first tank valve (V42) and configured to allow only one-way flow from the tank (30) to the pressure chamber (521) or only one-way flow from the tank (30) to the simulator unit (400). , having. Electric braking system after claim 15 , further comprising: a second tank line (351) and a third tank line (352) configured to connect the tank (30) to the cylinder chamber (511), the second tank line (351) having a normally closed second tank valve ( V41), and the third tank line (352) is provided with a check valve (352a) configured to allow only one-way flow from the tank (30) to the cylinder chamber (511). Electrical braking system according to any of claims 2 until 16 wherein the third exhaust pipe (323) is connected to the cylinder chamber (511) by uniting each of the other two wheel brakes (23, 24), the third exhaust pipe (323) being provided with a check valve (323a) configured to allow only one-way flow from each of the other two wheel brakes (23, 24) to the cylinder chamber (511). Electric braking system after Claim 17 wherein the fourth exhaust pipe (324) is connected to the cylinder chamber (511) by uniting each of the two wheel brakes (21, 22), the fourth exhaust pipe (324) being provided with a check valve (324a) having only one-way flow from each of the two wheel brakes (21, 22) to the cylinder chamber (511). Electrical braking system according to any of Claims 1 until 18 wherein the pressure applying device (200) comprises a first piston actuated by receiving power and a pump chamber whose volume is variable by displacement of the first piston, the pump chamber including a first pump chamber located in front of the first piston and having a second pumping chamber located behind the first piston, the pumping chamber further comprising: a first pumping reservoir line (331) configured to connect the first pumping chamber to the reservoir (30) and having a check valve having only allowing one-way flow from the reservoir (30) to the first pumping chamber; a second pump reservoir line (332) configured to connect the second pump chamber to the reservoir (30) and provided with a check valve allowing only one-way flow from the reservoir (30) to the second pump chamber; a third pump-reservoir line configured to connect the first pumping chamber to the reservoir (30) and provided with a check allowing only one-way flow from the first pumping chamber to the reservoir (30); a fourth pump-reservoir line configured to connect the second pumping chamber to the reservoir (30) and provided with a check valve allowing only one-way flow from the second pumping chamber to the reservoir (30); and a fifth pump tank line connected to the tank (30) after the third pump tank line and the fourth pump tank line are merged and provided with a drain valve configured to regulate a two-way flow. Electrical braking system according to any of Claims 15 until 19 , wherein the cylinder unit (500) further comprises a second piston (532) configured to divide the cylinder chamber (511) into a first cylinder chamber (514) and a second cylinder chamber (531), the third reservoir line (352) connecting the reservoir (30) to the first cylinder chamber (514); and the second reservoir line (351) connects the reservoir (30) to the second cylinder chamber (531). Electric braking system after claim 20 , further comprising: a first cylinder line (341) configured to connect the first cylinder chamber (514) to the second hydraulic circuit (S2); and a second cylinder line (342) configured to connect the second cylinder chamber (531) to the first hydraulic circuit (S1), the first cylinder line (341) being connected to the second intake line (312) and having a check valve (341a) allowing only one-way flow from the first cylinder chamber (514) to the second hydraulic circuit (S2); and the second cylinder line (342) connected to the first intake line (311) and having a return check valve (342a) allowing only one-way flow from the second cylinder chamber (531) to the first hydraulic circuit (S1). Electrical braking system according to any of Claims 15 until 21 wherein the third exhaust line (323) is connected to the cylinder chamber (511) by connecting each of the other two wheel brakes (23, 24) and is provided with a normally open cylinder valve (V61). Electrical braking system according to any of Claims 1 until 22 wherein the pressure-supply device (200) comprises a pressure-supply piston (222) actuated by receiving energy and a pump chamber whose volume is variable by displacement of the pressure-supply piston (222), the pump chamber including a first pump chamber (224) , which is arranged in front of the pressure supply piston (222), and a second pump chamber (225) which is arranged behind the pressure supply piston (222), the pump chamber having a first inlet line (311) connecting the first pump chamber (224) with the connecting the first hydraulic circuit (S1), a second inlet line (312) connecting the second pump chamber (225) to the second hydraulic circuit (S2), a third inlet line (313) connecting the second pump chamber to the first hydraulic circuit (S1), and a fourth inlet line (314) connecting the first pump chamber (224) to the second hydraulic circuit (S2), the pump chamber further having a first connection ung line (361) configured to connect the first inlet line (311) to the third inlet line (313) and having a check valve (361a) allowing only one-way flow from the third inlet line (313) to the first inlet line (311), and a normally closed first control valve (V51); a second connection line (362) configured to connect the fourth inlet line (314) to the first connection line (361) and having a check valve (362a) allowing only one-way flow from the fourth inlet line (314) to the first connection line (361) allows, is provided; and a third connection line (363) arranged in parallel to the second inlet line (312) and provided with a normally closed second control valve (V52).

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